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Is emergence uniform? If not, dig up a few seeds where emergence is patchy.Do there look to be enough seedlings emerged? Confirm your assessment by using your 1 m stick to count seedlings following the seedling count method (see field sampling). Look over the field within 2 weeks of planting.Later, these differences will be reflected in spike numbers and yield. They have many more leaves (15 vs 5) that are shorter and broader, more main shoot leaves (5 vs 3) and more tillers (4 vs 1). It shows that at the same age, seedlings planted shallowly are larger than those emerging from depth. The plants in the above photograph were sown on the same day but at different depths. Though seedlings of some genotypes can emerge from below 5 cm, this is too deep for many modern genotypes that have short coleoptiles. Concerns like protection from birds often make it necessary to plant deeper.
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The correct planting depth is one that places the seed where it can imbibe water for germination but not desiccate thereafter. Healthy seedlings can be produced from seed laid on the soil surface. The shallower the planting depth, the sooner the seedlings can emerge and commence photosynthesis and the earlier that tillering can start. Stapper, reproduced from FAO book Irrigated Wheat) Summary Shallower seeding speeds seedling growth and increases tillering. Planting too deep or too shallow reduces crop establishment. Planting depth and method Primary symptoms